Check handling of schemas

[mgirlich]

There were some bugs with schemas e.g. #1133 or #938, so it might be worth looking for other issues with schemas.

[vzel]

rows_update() with in_place = TRUE has stopped working with schemas since dbplyr 2.3.1

When used with sql server:
rows_update(
x = tbl(conn, dbplyr::in_schema("task", "ModelTaskParameters")),
y = db_parameters,
by = "Id",
unmatched="ignore",
copy = TRUE
in_place = TRUE
)
dbplyr package versions 2.3.1 and 2.3.2 give an error:
Error in UseMethod("escape") :
no applicable method for 'escape' applied to an object of class "dbplyr_schema"

dbplyr 2.2.1 works correctly